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PULPING OF HARDWOOD WITH SODIUM SULFIDE AND SODIUM HYDROXIDE WHILE GENERATING HYDROGEN SULFIDE IN SITU IN THE INITIAL PULPING STAGES
PULPING OF HARDWOOD WITH SODIUM SULFIDE AND SODIUM HYDROXIDE WHILE GENERATING HYDROGEN SULFIDE IN SITU IN THE INITIAL PULPING STAGES
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机译：在初始制浆阶段原位生成硫化氢时，用硫化钠和氢氧化钠对硬木进行制浆
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摘要
PULPING OF HARDWOOD WITH SODIUM SULFIDE AND SODIUMHYDROXIDE WHILE GENERATING HYDROGEN SULFIDE IN SITU IN THEINITIAL PULPING STAGESABSTRACT OF THE DISCLOSUREA process is provided for pulping hardwood,producing cellulosepulp in good yield and of high quality, with a low requirement for causticizedpulping liquor, which comprises in a first pulping stage pulping the hardwoodin an alkaline pulping liquor containing sodium sulfide at a temperaturewithin the range from about 110 to about 170°C while generating hydrogensulfide in situ by reaction of sodium sulfide with organic acids liberated inthe pulping; and then in a second pulping stage following directly after thefirst pulping stage, continuing the pulping at a higher temperature within therange from about 145 to about 190°C in the presence of an alkaline pulpingliquor comprising sodium hydroxide and a sodium sulfide until cellulosepulp is produced.
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